Brush-holder.



E. R. WHITNEY.

BRUSH HOLDER.

APPLIGATIOH HLBD JUNE 24, 19o4. I

917,223'. Patented Apr. 6, 1909.

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BRUSH HOLDER.

APPLIOATION FILED JUNI: 24, 1904.

917,223. Patented Apr.6,19o9.

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EDDY R. WHITNEY, oF

LYNN, MASSACHUSETTS, ASSIGNOR To GENERAL ELEoTRIo oon- PANY, A CORPORATION OF NEW YORK. v

v BRUSH-HOLDER.

Specification of Letters Patent. Application med :une 24, 1904. sel-iai No. 213,914.

Patented April e, 1909.

To all whom tt may concern: ,y

` Be it known that I, EDDY R. HITNEY, a citizen of the United States, residing at Lynn, in the county of Essex, State oflvlassachusetts, have invented certain new and useful Improvements in Brush-Holders, of, which the following is a specification. y My resent invention relatesV to brush holders for dynamo electric machines, and consists in various novel features` ofconstruction and arrangement all of which arel "point-- ed out with partlcularity in the claims annexed to and forming a part of this specification. 'A

For a better understanding of my invention, however,*reference may be had to the accom anying description and drawings in whichll have described and illustrated several -forms in which my invention maybe embodied.

Of the drawings, Figure 1 is an elevation of a brush holder constructed in accordance with my invention; Fi 2 shows the Opposite side of the brush ho der from that shown in Fig. 1; IFig. 8 is a plan view of the brush holder shown in Figs. 1 and 2; Fig. 4 is a sectional view taken on the line 4 4 of Figi 83. Fig. 5 is an elevation showing a slig tly modified form of m invention; Fig. 6 is an elevation of a detail'em loyed in the brush holder shown in Fig. 5; `ig. 7 is a section-on the line 7 7 of Fig. 5; Fig. 8 is a plan view of the brush holder shown in Fig. 5; and Fig. 9' is a perspective view of a modiiied detail which ma be employed in the brush' holder shown in ig. 5.'

Referring particularl to the brush holder shown in Figs. 1 to 4 oir the drawings, 1 represents the olt or stud on which the brush holder is mounted. A supportin member 2 is formed with an aperture throng which the stud 1 passes. A kerf 3 is formed in the ortion ofthe sup orting member 2 surroun ing the stud 1. X screwe` forms a means for pulling together the kerf to clamp the member 2 to the stud 1. The member 2 is formed with a hollow boss 5 which extends parallel to the stud 1. A brush car'r ing member 6 is pivoted to the member 2 by a bolt 7 which passes through the o ening in the hollow'boss 5. The bolt ma e secured at one end to the member 6 an a cotter pin 8 passing through the en d of the bolt 7 and cooperating washer 9 may be nut 14 into nhich the end the portions separated by employed to secure the members 2 and 5 together.

A brush 10 the lower end of which normally en ages the Vcollector ring or commutator su ace 11 is canied at the free end of the member 6 which is formed with an end portion againstwhich the side of the brush abuts,` and a pro'ecting portion 12 against whiclrthe end of t e brush abuts. A bolt 13 passing throughvan a erture formed for the purpose-in the brush into a threaded nut 14 carried by thex member 6 serves as a means for firmly clamping the brush 10 to the member 6.

v As shown in the drawings, the member 6 comprises a com aratively thin Portionl extending in a p ane transverse to the supporting stud 1 which is reinforced at its free end by an upper portion 16 extending parallel to the stud 1, and a triangular portion -17 extending parallel to the portion 15. The

threaded is secured between the parallel portions 15 and 17 by a pin 4or lock 20.

A projection 21 from the member-2 is so located that an engaging Ortion 22 will engage the lower 'surface of t e nut and prevent the member-6 from engaging the surface 11 of the commutator or collector ring when the brush 10 is shortened by ordinary wear or otherwise.

A helical'spring 25 is coiled 5. Oneend 26 of this sprin radially from the axis of the elix can be detachably hooked over a locking projection 27 formed for the purpose on the member 2.

' The other end 28 of the spring passes throuo'h an aperture formed for the purpose in t e end of a rod 29 which is slidingly located in a recess or groove 30 formed for the purpose in the member 6.

The upper end of the rod 29 passes through an aperture formed for the'purpose in the upper wall or portion 16 ofthe member 6 which is shaped to form a seat for the vthumb nut 31 lthreaded upon the upper end of the rod. As clearly appears in the drawing, this seat is dished w e the seat engaging portion of the nut 31 is convex. This prevents the nut from working loose while at the same time it the adjustment ol' the along the rod.

A projection 32 from vthe member 6 forms of the bolt 13 isl about the boss whichV extends a shoulder against which the end 26 of the spring may rest whenever it is desired to release the spring from its engagement with the locking projection 27 for any purpose.

A flexible conductor or plgtail 33 having` described forms a very simple and compact member v6 in which case, 3 5

of the spring can, of course, be

construction in which the brush carrying parts have comparatively small amount of inertia. The screw 4 it will be observed is readily accessible by reason of the cutting away of the upper portion 16 of the member 6 at a point adjacent the screw.

The tension of the spring 25and cosQQ'f guently the pressure with which'the brush 10 1s forced agamst the surface 11 can be adjusted, by giving successive half revolutions to the thumb nut 31. 7 When it is desired to remove the brush 10 from the surface 11 without moving the member 2 the end 26 of the sp may be released from its engagement'igiiz the notch or shoulder 27 and allowed to rest against the shoulder 32 ofthe i of course, the spring no longer ur'ffes the brush against the surface. The-use of makes'certain .that the spring 25 is always held under suflicient tension to prevent the spring from being displaced.

The brush member engaging projection 21 ofthe member 2 located adjacent the brush as shown forms a gage by means of which' the position in which the member 2 shall be clamped to the stud can readily be determined. With the rojection 21 located as shown it is impossi le to clamp the brush holder to the stud in such-a manner that the member 6 can ever engage the surface of the commutator or collector ring While at the same time any proper angular adjustment of the member 2 a out the stud 1 which may be desirable can be obtained.

v In the form ofv my invention shown in Figs. 5 to 8 inclusive, the sup orting member 2 is formed with a series of) projections 27 arranged in the form of an arc of a circle about the axis of the sprin 25. One end 26 of the spring 25 norma ly engages one of the projections 27.. The other end 28 of the spring rests against the stop 29 carried by t e brush carrying member 6. The tension adjusted by moving the end 26 from its ositlon ofengagement with one of the teet 27 to a position of engagement with another ofthe teeth spring 25 is formed engage the bosses.

vbe formed on the U-sha the shoulder 32 located as shown -ing in function4 to the projection 30 v U-shaped member pivoted to the supporti 27. A stop 30 is formed on the member 6 against which the end 26 vcan bear when it is desired to move the brush out of engagement with the surface.I In this form'of my invention the brush securing bolt 14 is screwed into a threaded a erture formed in the end of the member 6, t member 2 engaging the under portion of the member 6 directly, to prevent the latter from moving into contact with the surface. The member 6, used in this form of my invention comprises a portion 16 parallel to the shaft, and a portion 15 extending at right angles thereto. A recess 32 is formed in the portion 16 through which the clam ing screw 4 may be adjusted. Instead o a e projection 21 from the single boss 5 as in the construction shown in v Figs. 1 to 4 inclusive, the members 2 and 6 are formed with bosses 5 and 5- respectively. These bosses are formed with tapered ribsfon their peri heries and only the ends of the helix into W 'ch the body ofltihie s gives the utmost flexibility to the spring. This feature of construction may, of course, be em loyed in the brush holder iirst described? In this form of my invention also the member 6 may be formed of cast metal having a low specific gravity.- I may, however, form the brush carrying member out of a U-shaped piece 33 of sheet metal as shown inl Fig. 9. An integral projection 29 may ed member as shown corres onding in functlon to the projection ig. 5. A projection 30 correspondshown in Fig. 5 may -alsobe integrally formed on the memben What I claim as new and desire to'secure by Letters Patent of the United States, is,-

1,. In combination, a stud, a supportlng member clamped thereto, a brush carrying member, a helical spring Wound about the plvotal yconnection between the members, and a projec-- tion from the su porting member adapted to engage the brus carrying member near its brush carrying end, said projection being positioned so as to'prevent the brush carrying member from moving into contact with the surface against which the brush bears.

2. In combination, a supporting member, a brush carrying member plvotally connected thereto, a helical s ring wound about the pivotal connection etween the members, a notch formed in one of said members against which one end of the spring is secured, and a bolt slidingly mounted in the other of said members t'o which the other end of the sprin is secured.

3. n combination, a supporting member, a brush carrying member plvotally connected thereto, a helical spring wound about the pivotal connection between the members, a projection formed on one of said members against which one end of the s ring is secured, a bolt slidingl mounted m the other of said members to W 'eh the other end of the spring is secured, and a shoulder carried by said other member against which the projection engagin end of the spring may rest.

4. In com ination, a stud, a supporting member clamped thereto b a threa ed bolt, and a brush carrying mem er pivotally connected to the supporting member, said brush carrying member having two portions at `right angles to each other, and one of said otions being cut away to give access to the o t. l

5. In a brush holder, a supporting member, a brush carrying member pivote thereto, a bolt and nut for clampin a brush to said brush carrying member, an va pro'ection from the supportingmeinber ada te to be interposed between the nut and t e surface against which the brush bears to prevent enagement between the brush carrying memer and said surface.

6. In combination, a supporting member, a brush carrying member pivotally connected thereto, a helical spring wound about the pivotal connection between the members, means for securin one end of said s ring to one of said mem ers, and a bolt s idingly mounted in the other of said inembers to which the other end of the spring is secured. 7. In combination,a supporting member,

a brush carr ing member pivotally connected elical spring Wound about the between the members,

securing one end of vsaid members, a bolt the other of saidv memthereto, a pivotal connection means for detachabl said spring to one o slidingly mounted in bers, and means Ythe member toy which it is norma for disengaging the first mentioned end of said spring and for securing it to the other member.

8. In a brush holder, ber, a brush carrying member, a helical tension spring, means for normally securing one end of said spring toione ofl said members and the other end of said spring t'o the other of said members, and means for shifting the engagement of one end o f said s ring from ly secured to the opposite member. f

' 9. In a brush holder, asupporting member, a brush carrying member pivotally connected thereto, a spring formed lnto a helix, means for securing one end of said s ring to one of said members, a bolt carried y the other of said members to which the other end of said s ring is connected, said bolt being's'ubstantially tangential to said helix, andmeans for longitudinally adjusting the bolt. A

10. In a brush holder, a pair of relatively movable members, a tension spring in the form of a helix havin one end secured to one of said members, an the other end secured to the other of said members, a support carried by one of the members for engaging one end only of the helix, and a support carried by the other 0f said members for engaging the other end only of the helix, the axis of said helix being substantially at right angles i130 the direction of movement of the memers.

a supporting me1n-v l In witness whereof, I have hereunto set my I hand this twentieth d ay of June, 1904:`

EDDY R. WHITNEY. 'Vitnesses: I

DUGALD MoK. MoKILLor, JOHN JAY WALKER. 

